Musannaf Ibn Abi Shayba 27:121

Mu'alla ibn Mansur narrated to us, from Yahya ibn Hamza, from Abu Ishaq ibn Abi Farwa, from Yusuf ibn Sulayman, from his grandfather, from 'Amr ibn al-Hamiq, that he gave the Prophet, may Allah bless him and grant him peace, milk to drink. He said: "O Allah, let him enjoy his youth." For eighty years passed over him, and not a single white hair was seen on him.